Hydraulic jack



March 4, 1947. D 5 2,416,796 I HYDRAULIC JACK 2 Sheef-Sheet 1 Filed May '7, 1945 INVENTOR.

" kwu lfl H H. D0353 March 4, 1947. I D B 2,416,796

' HYDRAULIC JACK Filed May 7, 1945 2 Sfieets-Sheef 2 "-19 mmvmn.

Patented Mar. 4, 1947 HYDRAULIC JACK Richard H. Dobbs, Atlanta, Kans.

Application May 7, 1945, Serial No. 592,459

This invention relates to a hydraulic jack, and has for its principal object the application of jacks to raise the wheels of a motor vehicle when one or more of its wheel tires become deflated,

and means to hydraulically actuate the jacks, Fig. 11 is a modification for the jack when selectively. mounted on the longitudinal frame member of A further object of this invention is to secure the vehicle, also showing a retracting spring ina jack permanently to the axle adjacent each ternally applied. wheel to raise the same independently of the As a more concise description of the drawings others, or to raise the wheels in pairs if so desired. for this invention, it will be seen that the jack A still further object is to provide an efficient heretofore mentioned consists of a pluralit of means to retract the jack compactly to its nortubularmembers l arran to telescopically mally disengaged position as carried by the axle ga S e s, each being reduced in length of the Vehicle fo futur use. Q sufficient so that in their collapsed position as These and other objects will hereinafter be Shown in e- 21 the jack as a Whole will more fully explained, reference being had to the 13 above the road e for ample clearance accompanying drawings forming a part of this dllrmg l t 0 the vehicle. specification and in which like characters will F kf shown earned by aflvehlcle i apply to like parts in the difierent Views. adgacent lbs wheels 3 and has a hinge consist- Referring to the drawings: 3 mg of upper and lower leaves 4 and 5. respective- Fig. l is a sectional elevation of the jack enare f g g g Si 6 gaged as hoisting means for an axle of a motor 5 1 en i i p i f 9 er en 1 vehicle to show the hinge closed by rocking moveb 6 mi ea 8mg epslone mm uppfar ment of the axle on its path upward. y a coil spring 1, said lower leaf elng l1m1ted Fig 2 is a view of the jack collapsed and ar- In Its downwa'rdrock by bolt s-extendmg In t t th d f fr through the spring. The huge, being so arra 0 con 9? i f e 0m ranged as above described; will slant the shaft of P to position the axis 9 P J the jack from a vertical plane to substantially at r ght angles uo an axle when the same s raised. meet. the Slant attained by the wheels of the 3 sequel-e1 W on line, hicle when one of its tires is collapsed as shown Fig 2 lllusiiaimg of sprmgs to open by dotted lines in Fig. 6, and when the axle is f raised'to a horizontal plane, the hinge is closed 15 sectlon of the axle lookmg to carry the weight of the vehicle while the toward the pivot connection of the hinge to show Wheel and its tire is, removed for repair or t the U-bolts that secure the jack to the axle, the like, after which the jack is collapsed to t retracting spring being removed. engaged position as shown in Fig. 2.

Fig. 51s an enlarged fra men ry v ew t h w It will be seen that the upper leaf. l of the h p f the x m outward movement of hinge is secured to the axle by U-bolts 9 while the leeks telescopic joints, also the oiltight ri g the lower leaf 5 is a. medium to rockably carry 6 is an elevation of the jack pposite b0 40 the jack. Said lower leaf on its under side has that shown in Fig. 1, in its service raising a wheel an annular flange It in which the upper end of and its end of an axle from a slanti pos t on the top section H of the shaft is seated and seas shown y dotted lines e y the hinge s cured oil-tight as an upper head for the shaft, closed for a solid uniform bed while carrying the the other sections 1 being formed in like manner wheel and axle. to that of the saidtop sections except being Fig. '7 is a diagrammatical plane view to show equipped with rings l3 for oil-tight telescopic the pipe lines as positioned inworking relation engagement of the sections. There is also proto the instrument board, wheels and engine. I vided an annular stop ring l4 spaced inwardly Fig 8 is a front view of the oil valve controls from the first said rings, and adapted to engage and oil tanks. in an annular groove positioned in the inner 2.Claims. (01. 254 -86) Fig. 9 is a sectional view through one of the Valves.

Fig. 10 is a sectional view taken on line III-l0 of Fig. 9.

V the medium of springs l8.

wall of an adjacent section a spaced distance up- 7 wardfrom its lower end, said groove having a right angle shoulder and an upwardly and inwardly slanting wall to release the said ring for collapse of the sections telescopically while the right angle shoulder will function as a stop for an extreme expansion of said sections. 1

. It will be seen that a section l at the lower extremity of the jack has a head 16 threadedly engaged in the upper end thereof oil-tight to function as a head for the lower end of the shaft,

' while the lower end of said section has a rockablymounted concave-convex foot "to seat on the road bed,,floor, or the like to carry the load imposed on the jack. It will be understood that the jack is hydraulically operated as later described, however when the pressure is released the shaft members are free to collapse to a' position shown in Fig. 2, the action of which is through The ends of the springs are connected to the foot member and lower leaf of the hinge and ifmodified as shown in Fig. 11 a single spring l9 may be applied axially in the shaft as shown by dotted lines. The hy-' draulic actuating power for the jack'is provided through the medium of the oiling system pump of cate their working parts. Pipe line 32 leads to the,

crank case 35 which is tapped to receive the end of line 32 functioning as a'return for oil from the jack as the same is being retracted. It will be also noted that check valves 36 are positioned at various positions in thelines to avoid backward flow of oil when the jack is idle.

The operation of the invention is as follows. 7

It will be understood that the valve controls are positioned at a convenient place for the operator of the vehicle, and, for example, it will be asv sumed that the tire on the right rear Wheel becomes deflated, which tire must be removed for repair. To accomplish such, the jack that is carried by the axle adjacent the tire will be energized and labeled as Dyconsequntly valve D will be pushed inward, which in turn, will bring pipe 30 in communication with the oil pressure pipe 29 through the medium of the core 24 of the valve to supply hydraulic fluid to the jack to energize the same, which will raisethe axle adjacent the wheel and be somaintained for the required repair or change of the tire.

' When the tire has been changed, valve D is the vehicle, said system not being shown in the drawingathe oil being conducted through pipes,

later described'connecting the lacks separately to an oil. compression chamber 2! said pipe lines having valves to control the oil pressure for the jacks. Said valves, each consists of a. cylindrical engaging thereon. Slidably positioned in the shell is'a core 2t, said core having axially secured thereto a pullingheaded stem 25, that outwardly "extends through the apertured head for reciprocal movement of" the core to energize and disengage'its respective jack. It will be seen that the stem has a bayonet groove 25 in its side to outward as shown'in Fig. 9, in which instance,

the force of oil pressure is cut off by the core as it closes pipe 29, in which case, pipe line 3!) will communicate with pipe line 32 through the 7 medium of a depression 33 in the side of said core; and with which last said pipe communicates, and

so onforthe operation of the other valves and their respective jacks. It will be understood that pipelines to extend to and are connected to the upper extremity of their respective jacks, consequently; saidpipe lines So will function as a feed and exhaust for the oil to energize and disengag thejacks, respectively. To clarify each jack control,.the valves and their respective jacks will be referred to by corresponding alphabetic letters as follows: valve .A will control jack A" as shown in Fig. .7, valve B will control jack B, valve C will control jack C and valve D will control jack D'.. Theline 29 communicates with the compression chamber 29, which is charged with oil fromthe oil pump of the vehicle through a line I 3 that leads to the pressure guage 34" to indicate the pressure of thepump output. It will be understoodthat the. pump is not shown. However, all engines are equipped with such to lubrie I shell 2! having ahead 22 integrallyjoined to l f close one end, the other end of said shell being closed byan axially apertured head 23 threadedly ii alone as a separate, pump may be mounted in Patent is:

drawn forward, permitting the jack to drainits hydraulic fluid to the crankcase 35 through another pipe line 32 arranged therefor, and as a result, the jack'springs l8 will retract its sections to a folded position in close proximity to the'axle as well as eject the oil as the jack closes to its collapsed position, said jack being so retained for like operation in the future. The remaining jacks are operated in the same manner as the one just described, and each being equipped with its respective pipe so and valve to control the hydraulic fluid therethrough.

Fig. 11 shows a modified arrangement for mounting the jack which is accomplished by securing the same to the longitudinal frame member 31' of the vehicle adjacent each wheel,

and, also in said figure'is shown by dotted lines a spring l9 to retract the jack members;

While I have described the jack as being operated by the oil pump'system equipped with'the vehicle, I do not wish to'be restricted to such close relation to the fan belts of the engine, or the pump may b operated by an electric motor, and such other modifications may be rnadeas lie within the scope of the appended claims.

.Having fully described my invention what I claim as new and desire to secure by Letters 1. In a hydraulic jack of theclass havin rings for oil tight purposes, the upper and intermediate sections each having an annular ratchet groove internally applied and being spaced upwardly from their lower ends, and annular pawl to engage in said groove to func- 7 tion as a detent against separation of the sec- .tions at their extremity of expansion with respect to each other when the jack is inaction,

' said pawl and a groove therefor being externally I applied to the section a spaced distance down Ward from their upper ends, head to close the upper end of the lower section and a foot rcckably connected to th other end as a support for thejack, a leaf hinge to rock-ably carry the jack,

. means to secure one leaf of'said hinge to an axle of the motor vehicle, the other leaf being secured I to the upper end of the upper section as a closing head therefor and as carrying means for the described comprising incornbination with a motor Vehicle, .a hollow shaft comprised of upperylower and intermediate sections telescopically engaging and jack, a pipe line to connect the jack with the motor vehicle pressure oiling system and valves in the pipe line to control the oil pressure and direction of its circulation to energize and deenergize the jack.

2. In a hydraulic jack of the class described and as recited in claim 1, coil springs having one of their ends secured to the foot of the lack and their other ends being secured to the hinge as collapsing means for the telescopically engaged sections when compression is released, and other coil springs secured between the free ends of the hinge to rock the same from each other while the sections are collapsed.

RICHARD H. DOBBS.

REFERENCES CITED The following references are of record in the Number file of this patent:

UNITED STATES, PATENTS 

